Search results for " Degradation kinetics"

showing 5 items of 5 documents

Thermomechanical properties and thermal degradation kinetics of poly(methyl methacrylate) (PMMA) and polycarbonate (PC) filled with cerium-doped yttr…

2016

This paper reports on the thermomechanical properties and thermal degradation kinetics of poly(methyl methacrylate) (PMMA) and polycarbonate (PC) composites filled with cerium-doped yttrium aluminium garnet (Ce:YAG) at different contents ranging between 0.1 and 5 wt%, and prepared by melt compounding. The interaction between PMMA and the filler was much stronger than that between PC and the filler, and this resulted in a significant improvement in the dynamic mechanical properties of the PMMA composites. The presence of filler did not significantly increase the thermal stability of the PC, while an observable increase in the thermal stability was only observed at higher filler loadings for …

Materials sciencePoly(methyl methacrylate)Polymers and Plasticschemistry.chemical_element02 engineering and technology010402 general chemistry01 natural sciencesThermomechanical propertieschemistry.chemical_compoundThermal degradation kineticYttrium aluminium garnetMaterials ChemistryThermal stabilityPolycarbonateComposite materialMethyl methacrylatePoly(methyl methacrylate); Polycarbonate; Thermal degradation kinetics; Thermomechanical properties; Yttrium aluminium garnet doped with cerium;DopingGeneral Chemistry021001 nanoscience & nanotechnologyCondensed Matter PhysicsPoly(methyl methacrylate)0104 chemical sciencesCeriumchemistryPolycarbonateCompoundingvisual_artvisual_art.visual_art_mediumThermomechanical propertie0210 nano-technologyYttrium aluminium garnet doped with cerium
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Effect of preparation method on the properties of poly(methyl methacrylate)/mesoporous silica composites

2019

The preparation method of a polymer composite and the filler loading are amongst the factors that influence the properties of the final composites. This article studies the effect of these factors on the thermal stability and thermal degradation kinetics of poly(methyl methacrylate) (PMMA)/mesoporous silica (MCM-41) composites filled with small amounts of MCM-41. The PMMA/MCM-41 composites were prepared through in situ polymerisation and melt mixing methods, with MCM-41 loadings of 0.1, 0.3, and 0.5 wt.%. The presence of MCM-41 increased the thermal stability of PMMA/MCM-41 composites prepared by melt mixing, but in the case of the in situ polymerised samples, the MCM-41 accelerated the deg…

Mesoporous silica (MCM-41)Thermal degradation kineticThermal degradation kineticsMelt mixingIn situ polymerisationFOS: Environmental engineeringPoly(methyl methacrylate) (PMMA)Environmental engineeringSettore CHIM/07 - Fondamenti Chimici Delle Tecnologie13C {1H} CP-MAS-NMRSettore CHIM/02 - Chimica Fisica
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Corrigendum to “The effect of silica nanoparticles on the morphology, mechanical properties and thermal degradation kinetics of PMMA [Pol. Degrad. St…

2012

PMMA Silica 13C{1H} CP-MAS NMR Degradation kineticsSettore CHIM/02 - Chimica Fisica
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PMMA-titania nanocomposites: Properties and thermal degradation behavior

2012

Titania nanoparticles were prepared using a solegel method and calcination at 200 and 600 � C in order to obtain anatase and rutile phases, respectively. The obtained powders were used to prepare PMMAe titania nanocomposites by a melt compounding method. The effect of the crystalline phase and the amount of titania, in the range 1e5 wt.%, on the morphology, mechanical properties and thermal degradation kinetics of PMMA was investigated by means of X-ray diffractometry (XRD), transmission electron microscopy (TEM), 13 C cross-polarization magic-angle spinning nuclear magnetic resonance spectroscopy ( 13 C{ 1 H}CP-MAS NMR), including the measurement of proton spinelattice relaxation time in t…

Thermogravimetric analysisAnataseMaterials sciencePolymers and Plasticslaw.inventionlawnanocompositesPMMA Titania Nanocomposites Interfacial interaction Properties Degradation kineticsMaterials ChemistrytitaniaCalcinationFourier transform infrared spectroscopyComposite materialSettore CHIM/02 - Chimica Fisicachemistry.chemical_classificationNanocompositePolymerDynamic mechanical analysisCondensed Matter PhysicsPMMAAmorphous soliddegradation kineticsChemical engineeringchemistryMechanics of MaterialspropertiesPMMA; titania; nanocomposites; interfacial interaction; properties; degradation kineticsinterfacial interaction
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The effect of silica nanoparticles on the morphology, mechanical properties and thermal degradation kinetics of PMMA

2012

Abstract Silica–PMMA nanocomposites with different silica quantities were prepared by a melt compounding method. The effect of silica amount, in the range 1–5 wt.%, on the morphology, mechanical properties and thermal degradation kinetics of PMMA was investigated by means of transmission electron microscopy (TEM), X-ray diffractometry (XRD), dynamic mechanical analysis (DMA), thermogravimetric analyses (TGA), Fourier-transform infrared spectroscopy (FTIR), 13 C cross-polarization magic-angle spinning nuclear magnetic resonance spectroscopy ( 13 C{ 1 H} CP-MAS NMR) and measures of proton spin-lattice relaxation time in the rotating frame ( T 1 ρ ( H )), in the laboratory frame ( T 1 ( H )) a…

chemistry.chemical_classificationThermogravimetric analysisNanocompositeMaterials sciencePolymers and PlasticsPMMA Silica 13C{1H} CP-MAS NMR Degradation kineticsInfrared spectroscopyNuclear magnetic resonance spectroscopyDynamic mechanical analysisPolymerCondensed Matter PhysicsAmorphous solidChemical engineeringchemistryMechanics of MaterialsMaterials ChemistryFourier transform infrared spectroscopyComposite materialSettore CHIM/02 - Chimica Fisica
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